EP 1482644 A2 20041201 - Device and method for decoding of a trellis code
Title (en)
Device and method for decoding of a trellis code
Title (de)
Vorrichtung und Verfahren zur Dekodierung eines Trellis-Kodes
Title (fr)
Dispositif et procédé de décodage de codes en treillis
Publication
Application
Priority
- EP 00307647 A 20000905
- JP 25167099 A 19990906
Abstract (en)
Apparatus and method for decoding of a trellis code applicable to a recording/reproducing apparatus, like e.g. an AIT2 (Advanced Intelligent Tape System 2) tape streamer system. The trellis code has no DC component and no Nyquist frequency component. For encoding, a code word is generated according to a finite state transition chart wherein the cumulative DC electric charges (RDS) and cumulative AC electric charges (ADS) of the code series are set to finite values. The trellis code word, which has been NRZI-modulated, can be decoded without referring to its tail code (bit) and without referring to its head code (bit), when the above-mentioned trellis code word cannot take the start point at a plurality of states. <IMAGE>
The decoder has a state detection circuit (81) receiving code words detected by a detector. The circuit (81) finds whether the code words are duplicate code words and supplies duplicate code word detection parity (Q) to a head code selection circuit (82). The circuit (82) selects a head code (B0) based on the parity and supplies to a decoding circuit (83). The circuit (83) generates data words based on the head code. Independent claims are also included for the following: (a) a decoding method for decoding a code word to a data word in a decoding apparatus; and (b) a recording medium for recording a program which decodes a code word to a data word.
IPC 1-7
IPC 8 full level
G11B 20/14 (2006.01); G11B 20/10 (2006.01); H03M 7/14 (2006.01); H03M 13/25 (2006.01); H03M 13/31 (2006.01); H04L 25/49 (2006.01)
CPC (source: EP US)
G11B 20/10009 (2013.01 - EP US); G11B 20/10055 (2013.01 - EP US); G11B 20/10212 (2013.01 - EP US); H03M 13/256 (2013.01 - EP US); H03M 13/31 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 1081865 A2 20010307; EP 1081865 A3 20041124; EP 1081865 B1 20121107; EP 1482644 A2 20041201; EP 1482644 A3 20050525; EP 1887703 A1 20080213; JP 2001077695 A 20010323; JP 4239314 B2 20090318; US 6850573 B1 20050201
DOCDB simple family (application)
EP 00307647 A 20000905; EP 04077049 A 20000905; EP 07018448 A 20000905; JP 25167099 A 19990906; US 65543400 A 20000905